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It's become common practice to use virtual private networks for extra privacy and security in this era of mass surveillance, but a study published this week suggests such networks may not be as safe as they're commonly made out to be.

Cisco Systems has released security patches for authentication bypass, command execution and denial-of-service vulnerabilities affecting products that use its Adaptive Security Appliance (ASA) software, as well as the Cisco Catalyst 6500 series switches and Cisco 7600 series routers.

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